想做一个自己的数字货币行情的数据库，代码有点丑，各位大哥给点意见

import pymysql
from apscheduler.schedulers.background import BackgroundScheduler
import requests
import datetime
import time

logging.basicConfig(filename = 'tstw.log',format = '%(asctime)s - %(name)s - %(levelname)s - %(message)s')

db = pymysql.connect(host = "localhost",user = "root",password = "root",database = "dogeusdt",charset = 'utf8' )


global cursor 
cursor = db.cursor()
global sql
global last_datetime
last_datetime = None

sql1 = "CREATE TABLE IF NOT EXISTS `1min` ( `datetime` date,`open` float,`high` float,`low` float,`close` float)"
cursor.execute(sql1)

sql = 'insert into 1min(datetime,open,high,low,close) values(%(datetime)s,%(open)s,%(high)s,%(low)s,%(close)s);'
def get_kbar_and_save():  
    for i in range(3):
        try:
            r1 = requests.get("https://api.huobi.pro/market/history/kline?period=1min&size=1&symbol=btcusdt").json()
            r1_data = r1['data'][0]
            if (r1['status']=='ok') and (last_datetime - datetime.datetime.fromtimestamp(r1_d['id'])== datetime.timedelta(seconds=60)):
                r1_data['datetime'] = datetime.datetime.fromtimestamp(r1_d['id'])
                try:
                    cursor.execute(sql,r1_data )
                    db.commit()
                    last_datetime = r1_data ['datetime']
                    return logging.info('已写入数据库')
                except:
                    logging.warning('数据库写入错误')

                    r1_data['datetime'] = datetime.datetime.now()
                    r1_data['open'] = 0
                    r1_data['high'] = 0
                    r1_data['low'] = 0
                    r1_data['close'] = 0
            else:
                time.sleep(10)
        except:
            time.sleep(10)
sche_00 = BackgroundScheduler()
sche_00.add_job(get_kbar_and_save, 'cron', hour='*',minute='*', second='0', id='task0')
sche_00.start()```

觉得自己太菜了想放弃的时候该怎么心理建设。。。